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Material-Versatile Ultrabroadband Light Absorber with Self-Aggregated Multiscale Funnel Structures.

Yunha Ryu1, Changwook Kim1, Junmo Ahn2

  • 1School of Mechanical Engineering , Yonsei University , 50 Yonsei-ro , Seodaemun-gu, Seoul 03722 , Republic of Korea.

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Summary

Researchers developed a versatile ultrabroadband absorber using metal-coated aluminum oxide nanowires. This structure achieves high light absorption across the solar spectrum, showing potential for energy harvesting and optoelectronics.

Keywords:
broadband absorberfunnel structurematerial-versatilenanowire bundlesthermal-oxidation resistance

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Broadband light absorbers are crucial for energy harvesting and optoelectronic devices.
  • A versatile absorbing structure is needed for diverse operating environments.

Purpose of the Study:

  • To fabricate a material-versatile ultrabroadband absorber.
  • To achieve high absorptance over the AM 1.5G spectrum (300-2500 nm).

Main Methods:

  • Fabrication of metal-coated self-aggregated Al2O3 nanowire bundles with multiscale funnel structures.
  • Testing absorbers with various metal coatings (Al, W, TiN).
  • Evaluation of thermal-oxidation resistance.

Main Results:

  • Achieved high absorptance of ~0.9 over the 300-2500 nm spectrum for multiple metal coatings.
  • Demonstrated plasmonic nanofocusing and index-matching effects of the funnel structure.
  • Al-coated absorber showed superior thermal-oxidation resistance due to a protective alumina layer.

Conclusions:

  • The developed absorber structure enables strong ultrabroadband absorption with various metal coatings.
  • The structure's design overcomes differences in optical properties of coating materials.
  • Al-coated absorbers offer excellent thermal-oxidation resistance for practical applications.